Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
  • A01G7/00—Botany in general
• • C—CHEMISTRY; METALLURGY
  • C05—FERTILISERS; MANUFACTURE THEREOF
  • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
  • C05D9/00—Other inorganic fertilisers
  • C05D9/02—Other inorganic fertilisers containing trace elements
• • C—CHEMISTRY; METALLURGY
  • C05—FERTILISERS; MANUFACTURE THEREOF
  • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
  • C05G5/00—Fertilisers characterised by their form
  • C05G5/10—Solid or semi-solid fertilisers, e.g. powders

Definitions

• the present invention relates to an iron-based powder for supplying iron ions that supplies iron ions that contribute to the growth of plants, and an iron-ion supplying material using the same.
• Iron is an essential nutrient for plant growth, and plays roles in chlorophyll synthesis, energy production in mitochondria, and the synthesis of nitrogen fertilizer into amino acids.
• Patent Document 1 describes that as a material that stably supplies divalent iron ions to plants, 80% by mass or more of iron and 0.4% by mass or more and 1.5% by mass or less An iron powder is disclosed in which 50% by mass or more of the total amount of iron powder has a particle size of 100 ⁇ m or more and 10 mm or less.
• Patent Document 2 discloses a plant growth promoter comprising ferrous oxide and a chelating substance that allows plants to efficiently absorb iron.
• the present invention solves the above problems and provides iron ion supply that can improve the growth condition of plants (crops) by elution of divalent iron ions and increase the yield of crops obtained by such improvement. It is an object of the present invention to provide an iron-based powder for iron ions, together with an iron ion supply material containing the iron-based powder for supplying iron ions.
• the inventors developed an iron powder with a high content of metallic iron and a low content of oxygen, with the aim of promoting the elution of divalent iron ions from the iron-based powder.
• the present invention is based on the above findings, and the gist and structure thereof are as follows.
• An iron-based powder for supplying iron ions that contributes to plant growth wherein (A) the metallic iron content is 75.00% by mass or more and the oxygen content is 6.00% by mass or less A total of 100 parts by mass of iron powder and (B) iron powder having a metallic iron content of 50.00% by mass or more and less than 75.00% by mass and an oxygen content of more than 6.00% by mass and less than 25.00% by mass.
• the iron-based powder for supplying iron ions wherein the content of the iron powder (B) is 1.0 parts by mass or more and 50.0 parts by mass or less.
• the iron-based powder for supplying iron ions as described in 1 above having a median diameter D 50 of 50 ⁇ m or more and 10 ⁇ 10 3 ⁇ m or less and a maximum particle size of 80 ⁇ m or more and 30 ⁇ 10 3 ⁇ m or less.
• An iron ion supply material comprising the iron-based powder for supplying iron ions according to 1 or 2 above.
• iron ions that contribute to the growth of plants are produced. It is possible to provide an iron-based powder for supplying iron ions and an iron-ion supplying material using the same.
• the iron-based powder for supplying iron ions serves as a source for supplying iron ions that contribute to the growth of plants.
• the above-mentioned "iron ion contributing to plant growth” is a divalent iron ion.
• the above iron-based powder for supplying iron ions includes (A) iron powder having a metallic iron content of 75.00% by mass or more and an oxygen content of 6.00% by mass or less, and (B) a metallic iron content of 6.00% by mass or less.
• the remainder other than metallic iron and oxygen is a metal component contained as an oxide and inevitable impurities.
• the amount of metal components other than metallic iron and unavoidable impurities is not particularly limited, but is 5.00% by mass or less in the iron powder of (A) and 10.00% by mass or less in the iron powder of (B). Each is preferable.
• the metal components and unavoidable impurities contained in the above-mentioned oxides, as well as the unavoidable impurities mixed in in the manufacturing process of the iron-based powder for supplying iron ions have a mass of 6.00% in the iron-based powder after mixing. % or less, more preferably 1.00% by mass or less.
• the lower limit of such unavoidable impurities is industrially about 0.03% by mass.
• the reason why the iron-based powder for supplying iron ions of the present invention has a high ability to supply iron ions is presumed to be as follows.
• the iron powder of (A) has a metallic iron content of 75.00% by mass or more and an oxygen content of 6.00% by mass or less, and a metallic iron content of 50.00% by mass or more and less than 75.00% by mass,
• the iron powder of (B) which has undergone oxidation, is not oxidized. It has a higher potential than the iron powder (A).
• a corrosion current flows from the iron powder (B) at a high potential to the iron powder (A) at a low potential.
• This corrosion current returns to the iron powder (B), which has a higher potential than the iron powder (A), through an electrolytic solution such as sodium chloride aqueous solution or sulfuric acid that is normally present in rice fields, and then returns to the iron powder (A), which has a higher potential than the iron powder (A).
• a local battery mechanism is established by flowing again into the . Due to the action of this mechanism, the oxidation reaction of the iron powder (A) at a low potential is promoted in the early stage of the reaction, making it easier to generate and elute divalent iron ions.
• the iron powder of (B) since the iron powder of (B) has undergone oxidation to some extent, the total amount of divalent iron ions eluted is inferior to that of the iron powder of (A). Therefore, if too much iron powder (B) is mixed, the amount of divalent iron ions eluted from the mixture of iron powder (A) and iron powder (B) will be lower than that of iron powder (A) alone. The amount of iron ion elution becomes too low. Therefore, it is necessary to limit the upper limit of the content of iron powder (B).
• the metallic iron content in the iron powder (A) is less than 75.00% by mass, the potential difference with the iron powder (B) will be too small, making it difficult for the above-mentioned corrosion current to flow. Therefore, the oxidation reaction of the iron powder (A) is slowed down, and the production and elution of divalent iron ions is reduced.
• the iron-based powder for supplying iron ions is (A) iron powder having a metallic iron content of 75.00% by mass or more and an oxygen content of 6.00% by mass or less. and (B) iron powder having a metallic iron content of 50.00% by mass or more and less than 75.00% by mass and an oxygen content of more than 6.00% by mass and less than 25.00% by mass; B) It is necessary to mix two types of iron powder.
• the content of the iron powder (B) (mass of only metallic iron and oxygen) is 1 It is important for the iron-based powder for supplying iron ions of the present invention to have a content in the range of .0 parts by mass or more and 50.0 parts by mass or less.
• the metallic iron content may be 100% by weight and the oxygen content may be 0% by weight.
• the definition of the particle size described in Patent Document 1 described above is limited only to the particle size of 50% by mass or more of the entire iron powder, and is not an index of the particle size of the entire iron powder.
• it is permissible for extremely fine iron powder to be mixed in but if there are many extremely fine iron powders like this, they will be blown away by the wind during spraying and plowing, and the actual amount applied to the soil may be reduced.
• sufficient effects may not be exerted, such as a decrease in iron powder and a decrease in the amount of iron powder in the soil that can be used by plant roots.
• extremely coarse iron powder may be mixed in.
• the specific surface area which is the area per unit mass of iron powder, becomes small.
• the preferred conditions for the particle size of the iron-based powder for supplying iron ions of the present invention are defined as follows. That is, the median diameter (median value of particle diameters calculated based on cumulative volume frequency) D 50 of the iron-based powder for supplying iron ions is set to be in the range of 50 ⁇ m or more and 10 ⁇ 10 3 ⁇ m or less, and the maximum particle size is further defined as 80 ⁇ m or more. It is preferable to do so. Moreover, the upper limit of the maximum particle size is not particularly limited, but is preferably about 30 ⁇ 10 3 ⁇ m.
• the iron-based powder for supplying iron ions becomes too fine ( D50 less than 50 ⁇ m or maximum particle size less than 80 ⁇ m), it may be blown away by the wind during spraying or cultivation, resulting in a reduction in the amount actually applied to the soil. This is because it leads to a decrease in the amount of iron powder present in the soil area that can be used by plant roots, making it difficult to obtain the intended effect.
• the method for measuring the metallic iron content of the powder is in accordance with JIS A 5011-2 "Metallic iron quantitative method".
• the method for measuring the oxygen content of the powder is in accordance with JIS Z 2613 "General rules for oxygen determination method for metal materials”.
• the method for measuring the particle size of the powder is in accordance with JIS Z 8815 "General Rules for Sieving Test Methods”.
• the iron-based powder for supplying iron ions in the present invention can be manufactured using a water atomization method or a gas atomization method.
• the specific manufacturing method is as follows.
• a water atomization method or a gas atomization method can be used, in which water or gas is sprayed onto a molten metal, and the powder is pulverized and solidified by cooling.
• the produced powder may be classified or mixed by various methods to adjust the metallic iron content and oxygen content according to the present invention. That is, the iron-based powder for supplying iron ions according to the present invention can be manufactured by a water atomization method or a gas atomization method, but it can also be manufactured by a pulverization method or an oxide reduction method. Note that the conventional iron-based powder for supplying iron ions uses iron powder reduced by an oxide reduction method. On the other hand, in the present invention, it is possible to mix and use iron powder which is not reduced in the first place or whose oxygen content is increased by a method in which reducing conditions are relaxed.
• a raw material with a high metallic iron content is used. or reduction using carbon or hydrogen, which is a step of removing oxygen from iron-based powder.
• the metallic iron content of the iron powder (B) of the present invention is adjusted to 50.00% by mass or more and less than 75.00% by mass, and the oxygen content is adjusted to more than 6.00% by mass and less than 25.00% by mass.
• we specifically use raw materials with low metallic iron content relax the reduction conditions using carbon or hydrogen, which is the process of removing oxygen from iron-based powders, or do not carry out reduction, iron-based powders. Operations such as making the surface of the powder particle easier to oxidize by crushing it to make it finer may be performed.
• iron powder (B) In order to adjust the content of iron powder (B) to 1.0 parts by mass or more and 50.0 parts by mass or less in 100 parts by mass of the mixed powder of iron powders (A) and (B) of the present invention, It is necessary to mix the iron powders (A) and (B) until they become uniform. Therefore, it is preferable to use a mixing device such as a V-type mixer, double cone mixer, or conical blender.
• a mixing device such as a V-type mixer, double cone mixer, or conical blender.
• the median diameter D 50 of the iron-based powder for supplying iron ions to 50 ⁇ m or more specifically, it may be classified using a sieve.
• the crushing conditions of the iron-based powder used as a raw material may be adjusted.
• the maximum particle size of the iron-based powder for supplying iron ions In order to adjust the maximum particle size of the iron-based powder for supplying iron ions to 80 ⁇ m or more, specifically, it may be classified using a sieve. On the other hand, in order to adjust the maximum particle size of the iron-based powder for supplying iron ions to 30 ⁇ 10 3 ⁇ m or less, specifically, the crushing conditions of the iron-based powder used as a raw material may be adjusted.
• efficient supply of iron ions is realized by setting the proportion of particles of 100 ⁇ m or more and 10 mm or less in the iron-based powder for iron ion supply to 50% by mass or more.
• the proportion of particles having a size of 100 ⁇ m or more and 10 mm or less in the iron-based powder for supplying iron ions in the present invention is not particularly limited.
• the proportion of particles having a size of 100 ⁇ m or more and 10 mm or less in the iron-based powder for supplying iron ions may be 0% by mass or 100% by mass.
• iron ion supply material By using the iron ion supply material containing the iron-based powder for supplying iron ions according to the present invention that has undergone such a procedure, it is possible to effectively distribute the iron ion supply material containing a high concentration of iron near the roots of plants. Therefore, divalent iron ions can be efficiently supplied to plants.
• the iron-based powder for supplying iron ions in the iron ion supplying material is preferably 50% by mass or more.
• the iron ion supply material contains iron-based powder for supplying iron ions as the main component, and one or more of nitrogen, phosphoric acid, and potassium, which are nutrients necessary for plant growth, as other subcomponents. It can be produced by adding.
• iron powders (A) and (B) having the metallic iron content, oxygen content, particle size, etc. shown in Table 1 were used. Each iron-based powder was prepared by mixing in various ratios. All iron powders were made by reducing mill scale generated during hot rolling of steel materials. Characteristics of the iron-based powder in this example were evaluated as follows. The metallic iron content of the powder was measured according to JIS A 5011-2 "Method for determining metallic iron.” The oxygen content of the powder was measured according to JIS Z 2613 "General rules for oxygen determination method for metal materials”. The particle size of the powder was measured according to JIS Z 8815 "General Rules for Sieving Test Methods". Furthermore, a median value (median diameter) D50 , which is a representative value of the particle size of the entire powder particles, was calculated from the above particle size and mass frequency.
• the content of the iron powder of (B) is 1.0 parts by mass for a total of 100 parts by mass of iron powder with an oxygen content of more than 6.00 mass% and less than 25.00 mass%.
• the total iron content, oxygen content, D50 , and maximum particle size of the powder contribute to the performance of the iron-based powder for supplying iron ions of the present invention. It can be seen that the use of powder allows divalent iron ions to be efficiently supplied to plants, and is effective in increasing plant growth and yield.

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• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Botany (AREA)
• Ecology (AREA)
• Forests & Forestry (AREA)
• Environmental Sciences (AREA)
• Pest Control & Pesticides (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Fertilizers (AREA)

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Citations (4)

• 2023
  • 2023-03-14 JP JP2023567049A patent/JPWO2023223647A1/ja active Pending
  • 2023-03-14 WO PCT/JP2023/009953 patent/WO2023223647A1/ja not_active Ceased

Patent Citations (4)

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